"A vast mixed company also went with them." ?????

[Bible Speaks]

"A vast mixed company also went with them."—Ex. 12:38.

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“Do Not Forget Kindness to Strangers”

After Jehovah freed his people from slavery in Egypt, he gave them laws that taught them to show kindness toward the foreigners who left with them. (Exodus 12:38, 49; 22:21) 

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Since life is not always easy for foreigners, Jehovah lovingly cared for them. For example, they could glean food that the harvesters left behind.—Leviticus 19:9, 10.

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Rather than just command the Israelites to respect foreigners, Jehovah wanted them to remember how it felt to be a foreigner. (Read Exodus 23:9.) Even before the Israelites became slaves in Egypt, the Egyptians did not like them because they were different. (Genesis 43:32; 46:34; Exodus 1:11-14) 

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The Israelites had a hard life as foreigners. Jehovah wanted them to remember that and to be kind to the foreigners who were living among them.—Leviticus 19:33, 34.

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https://wol.jw.org/en/wol/d/r1/lp-e/402016762?q=ex+12%3A38&p=par#h=11